How can I increase my bandwidth?

[Orionjur Tor-admin <tor-admin@xxxxxxxxxxxxxxxxxx>]

I am operating 2 tor-servers: one under FreeBSD and other under Debian
Lenny.
Their parameteres:
1.  uname -a
 8.1-STABLE FreeBSD 8.1-STABLE #0 r34M: Wed Nov 24 10:02:09 IRKT 2010
RAM 512 Mb
CPU 1GHz
root@xxxxxxxxxxxxxxxxxxxxxxxxxxxx:/root/src/sys/amd64/compile/ISPSYSTEM
 amd64
 Tor v0.2.2.20-alpha
OpenSSL 0.9.8n 24 Mar 2010
non-exit node
2. uname -a
Linux 2.6.18-028stab070.4-ent #1 SMP Tue Aug 17
19:03:05 MSD 2010 i686 GNU/Linux
RAM 786432 kB
CPU 502.313 MHz
Tor version 0.2.2.20-alpha
OpenSSL 0.9.8g 19 Oct 2007
exit-node

As it can be shown from the Tor Statistics the bandwidth of the first
node is more that one of the second:
http://torstatus.blutmagie.de/router_detail.php?FP=c82e893bbe859e01a9bb38517ff6b3f91493560d
http://torstatus.blutmagie.de/router_detail.php?FP=2ce7d7703c7679f0bbe711668ff0923ffcf8997f

What can be a cause of that and how can I increase the bandwidth of my
Debian node?
P.S. I have set the next setting in the '/etc/tor/torrc' of both of them:
RelayBandwidthRate 200 KBytes
RelayBandwidthBurst 400 KBytes

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